Bit



I Get. 5 1926.

E. E. DAVIS BIT Filed Oct. 1922 EELUavw WITNESS i atented Oct. 5, 1926 PATENT OFFICE.

ELMER n. nAvIs, or oIsoo, TEXAS.

BIT.

Application filed October 6, 1922.

This invention relates to hydraulic fishtail bits, and has for its object to provide the shank of the bit with spaced series of openings, with the series of openings lying at opposite sides of the blade of the bit and disposed at angles to allow water to pass over and wash the entire area of the blade, and in this way prevent mud or the like from clinging to the sides of the blade.

In carrying out the invention, I make the shank of the bit hollow to facilitate drilling of the holes or openings for the purpose above mentioned. without weakening the strength of the bit in its entirety.

Another very important object of the in vention resides in providing the bit with reinforcing webs which extend dow wardly from the shank and affords the plate the desired strength at a point immediately beneath the collar.

The nature and advantages of the invention will be better understood when the following detailed description is read in con nection with the accompanying drawing, the

' invention residing in the construction, combination, and arrangement of parts as claimed. i

In the drawing forming part of this application, like numerals of reference indicate similar parts in the several views, and wherein v Figure 1 is a side elevation of the bit.

Figure 2 is an edge elevation.

Figure 3 is a sectional view taken on line 38 of Figure 1.

Referring to the drawing in detail, 10 indicates the blade of the bit which is of wellknown construction. while the shank which associates the bit with the drill collar (not shown) is indicated at 11. This shank is hollowed to facilitate drilling t the holes or openings indicated at 12, and which holes are arranged in a series, the latter lying at opposite sides of the blade 10. The shank is hollowed in a manner to provide for the proper thickness of the material at the bottom of the shank through which the holes 12 are drilled so as not to materially weaken the bit in its entirety. It will be noted that the holes or openings 12 are disposed at such angles that water passing through these Serial No. 592,837.

holes will wash the entire area of both sides of the blade and in this way prevent mud or the like from clinging to the blade, which at present is a source of trouble with bits of this character. v I

It will be noted from an inspection of the drawing that the shank is extended to provide reinforcing webs or ribs 18,which are arranged at opposite sides of the blade immediately beneath the shank, and affords the blade, the desired strength at that point where it is most needed, namely, beneath the collar 11..

While it is believed that from the fore going description, the nature and advantages of the invention will be readily apparent, I desire to have it understood that I do not limit myself to what is herein shown and described, and that such changes may be resorted to when desired as fall within the scope of what is claimed.

What I claim is 1. A fish tail bit comprising a blade, a hollow shank arising therefrom and including an annular thickened portion at its point of junction with the blade and ribs connecting 'each face of the blade adjacent each side edge of the faces of the blade with the enlargement extending downwardly upon the blade for a distance approximately equally one-third of the length of the blade.

2. A fish tail bit comprising a blade, a

J hollow shank arising therefrom and including an annular thickened portion at its point of junction with the blade and ribs connecting each face of the blade adjacent each side edge of the faces of the blades with the enla gement extending downwardly upon the blade for a distance approximately equally one-third of the length of the blade, said thickened portion being provided with series of spaced bores formed in the enlargement and arranged at opposite sides of the blade with the bores of each series opening into said socket at the upper ends thereof and through the bottom of the enlargement intermediate said ribs and at the junction of the enlargement with the blade through the lower ends thereof.

In testimony whereof I affiX my signature.

ELMER E. DAVIS. 

